5.8 years ago, I began a semester in college and switched to Dvorak, cold turkey. I seem to top out at ~100 wpm, with more of a 75 wpm cruise speed. I think I did ~70 wpm max on Qwerty after 3 years of serious use. I was taught to touch-type earlier, but using 6 or so fingers on a memorized keyboard, I thought "proper" typing was too slow.
I first heard about Colemak when the latest news was that it would be in the next release of X.org, but I started on it (nights only) yesterday. Moving toward a net admin role at work is placing me in front of Qwerty more frequently, and I can't type on it at all anymore.
I'm hoping that Colemak will be better suited to the Qwerty world; if not, I'll stick with Dvorak. No way am I ever going back to Qwerty full-time! I tried that first, to see if it could be a milestone on the road to Colemak, but it's too painful. That was actually a major reason for going Dvorak in the first place.